Combined pump and valve



April 17, 1934. L1- JANET-rE COMBINED PUMP AND VALVE Filed ug. 2l, 1931 Paten-tesi Apr. 17, i934 UNITED STATES PATENT OFFICE This invention relates to pumps particularly intended for circulating liquid and having means for completely closing the passageway to prevent circulation when the pump is stopped. A particular example of the use of this invention is in connection with hot water systems. In some such systems a single heater or furnace is used to supply heat for the hot water heating system and also for a water heating system for supplying hot water. In systems of this kind it is frequently desirable to have a pump for forcing circulation in the hot water heating system and means for closing off the hot water heating system so that the furnace may be used solely for heating water. The present invention provides such means for forcing the circulation of the water and also for automatically stopping the circulation when the pump or forcing means is stopped.

The objects of this invention are to provide a pump and shut-off valve of the character indicated; to provide a pump with means whereby the passageway therethrough will be automatically closed when the pump is stopped; to provide a pump having a combined valve and rotor or impeller; and to provide such other novel features of construction and improvements in operation as will be described more fully hereinafter. In the accompanying drawing illustrating this invention;

Figure 1 is a longitudinal sectional view;

Figure 2 is a sectional view taken on line 2-2 of Figure 1; and

Figure 3 is a detail showing the valve in closed position.

In the particular form of the invention as shown in the drawing, the pump casing or body 5 is provided with an inlet 6 and outlet 7, these portions being flanged or otherwise formed for connection with inlet and outlet pipes.

The lower end of the pump casing or body 5 is closed by a cap or cover plate 8, which is engaged by a pipe support 9 on which the pump is mounted.

The upper end of the casing 5 is closed by a combined cap and motor support 10 having legs l1 for supporting a motor (not shown). The cap 10 has a downwardly projecting bearing or sleeve l2 with a disc or closure 13 at the lower end which ts closely within the cylindrical upper portion of the casing and forms the top of the pump chamber 14.

A shaft 15, which may comprise the motor shaft or which may be driven in any suitable manner, extends down through the bearing 12 and engages with a second bearing 16 in the cap or closure 8. Any suitable packing or gland construction may be used, as shown at 1'7, to make a tight closure between the shaft and the cap.

The impeller or rotor 18 has a hub 19 which is threaded to engage with a correspondingly threaded portion 20 of the shaft l5. A .disc or valve member 21 is arranged at the top of the hub 19 and is preferably formed integrally therewith. This disc or valve is connected by blades or varies 22 with a lower ring 23 which fits closely within the inlet opening 24 for the impeller chamber 14 and which has a central opening 25 to permit water or liquid to pass up into said chamber. A valve seat 26 surrounds the opening 24 and is adapted to be engaged by the valve 21 to close the opening to the pump.

The threads 20 on the shaft 15 are preferably of long pitch so that the combined impeller and the valve may move dovm by gravity to close the passageway. However, I have also shown a coiled spring 27 having one end 28 secured to the shaft 15 and the other end 29 secured to the impeller 18, to assist in closing the valve.

In a water heating system of the character above referred to, automatic devices may be utilized for starting and stopping the motor which drives the pump. Figure 1 shows the pump with the impeller in operative position. At such time water win be drawn in through the intake s and win 85..,

pass up through the opening 25 and be driven by the impeller blades out through the discharge 7, this forming a centrifugal pump which operates in a well known manner. The impeller would normally be in lowered position with the valve 21 closed, but as soon as the motor is started and the shaft 15 begins to turn, the screw will cause the impeller to be raised to operative position as shown in Figure 1 and at the same time will place a tension on the spring 27.

When the shaft 15 stops rotating the action of gravity will tend to cause the impelleror propeller 18 to travel downwardly on the screw until the valve 21 engages with the valve seat 26, thus closing the passageway through the pump. This movement is further facilitated by the spring which also tends to rotate the impeller on the shaft and thus return it to normal or closed position.

By means of this arrangement, it will be seen that I provide simple and effective means which may be readily coupled into a pipe system and which will serve both for circulating the liquid and for stopping circulation of the same. It will also be noted that changes may be made in the arrangement of the parts or details of construction in order to adapt the apparatus for different systems or conditions and therefore I do not wish to be limited to the particular form shown and described `except as specified in the following claims, in which I claim:

1. In a centrifugal pump for pumping liquids, the combination of a casing having inlet and outlet orifices and having a vertical opening therethrough, closures for the ends of said opening, a shaft having its bearings in said closures and extending through the casing and having a threaded portion, a pump chamber surrounding the shaft and having an annular inlet in the bottom thereof with `a valve seatsurrounding the same, a threaded hub engaging with the threaded portion of the shaft and having a valve at the upper end thereof adapted to engage with said seat, and a ring spaced from the valve, propeller blades connecting the valve and the ring and a spring having one end secured to the shaft and the other end secured to the hub, the arrangement being such that the spring will tend to move the hub and connected parts downwardly to close the valve and the rotation of the shaft will cause the hub and connected parts to be raised to operative position, means being provided to stop the hub in such position.

2. A pump of the character set forth for circulating liquids, having a casing provided with inlet and outlet openings adapted to be connected to pipes, a cap for closing the lower portion of the casing, a combined cap and motor support for closin,rr the upper portion of the casing, a motor shalt having its bearings in said caps and having a threaded portion within the casing, means for actuating said shaft, an impeller having a threaded hub for engagement with the threaded portion of the shaft, a valve projecting outwardly from the top of the hub, a ring spaced from the valve, impeller blades positioned between the valve and ring, a passageway through the casing having a valve seat adapted to be engaged by said valve, and a coiled spring having one endK connected with the shaft and the `)ther end connected with the valve member, the arrangement vbeing such that when the shaft is revolved in pumping direction, the threads on the shaft will cause the valve and impeller to raise to open the passageway and when the motor is stopped the spring coacting with gravity will cause the valve to move downwardly to closed position.

JOHN T. JANE'I'IE. 

